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Image reading apparatus and image forming apparatus

a reading apparatus and a technology of forming apparatus, applied in the direction of digital output to print units, instruments, digitally marking record carriers, etc., can solve the problems of increasing the cost of led arrays, white leds are not optimum for illuminating devices, and prior art suffers

Inactive Publication Date: 2008-02-07
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]In a fifth aspect of the present invention, there is provided an image forming apparatus that includes an image reading device adapted to read an original as an image, and forms the image of the original on a recording sheet, wherein the image reading device comprises an illuminator adapted to illuminate an original, a reader adapted to read the original i

Problems solved by technology

However, the prior art suffers from the following problem:
Therefore, white LEDs are not optimum for an illuminating device for a color scanner.
However, the selecting operation thereof largely increases the cost of the LED array, which makes the illuminating device expensive.

Method used

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  • Image reading apparatus and image forming apparatus
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  • Image reading apparatus and image forming apparatus

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Embodiment Construction

[0032]The present invention will now be described in detail below with reference to the accompanying drawings showing preferred embodiment thereof.

[0033]FIG. 1 is a schematic diagram of an image reading apparatus having an ADF (automatic document feeder) mounted thereon, according to an embodiment of the present invention.

[0034]Referring to FIG. 1, the ADF 100, which is an original conveying device, is mounted on the image reading apparatus 200. Hereinafter, a description will be given of the arrangement thereof together with its operation.

[0035]As shown in FIG. 1, the ADF 100 sequentially feeds originals to a separating section 2 by a pickup roller 1 one by one from an uppermost original of an original bundle S set on an original tray 20 with their front surfaces facing upward. The separating section 2 has a separation roller and a separation pad disposed below the separation roller, and is configured such that originals are separated one by one from the uppermost original of the o...

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PUM

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Abstract

An image reading apparatus equipped with an illuminating device having little tint variation. A lamp unit illuminates an original with light, and includes a plurality of white LEDs, and a plurality of auxiliary LEDs that emit lights of different colors and arranged in a manner associated with the white LEDs. A CPU causes auxiliary LEDs to be lighted, so as to correct a color of light emitted from each of the white LEDs. An image reading unit reads the original illuminated by the lamp as an image.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an image reading apparatus equipped with an illuminating device, and an image forming apparatus.[0003]2. Description of the Related Art[0004]Conventionally, an image reading apparatus (original reading apparatus) is provided with an illuminating device for illuminating an original on a read line-by-read line basis. Many of illuminating devices of this type have conventionally been using a halogen lamp, a xenon lamp, or a like light source. Recently, as a more efficient light source than the conventional ones, there has been proposed a light source which uses an LED array comprised of a plurality of LEDs (Light Emitting Diodes) in a linear arrangement (e.g. in U.S. Pat. No. 5,767,976).[0005]However, the prior art suffers from the following problem:[0006]When a white LED array formed by arranging a plurality of white LEDs is used as an illuminating device for a color scanner, the arranged ...

Claims

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Application Information

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IPC IPC(8): H04N1/46
CPCH04N1/4076
Inventor SEKIYA, TAKESHI
Owner CANON KK